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The Shlisselburg Fortress or Oreshek Fortress (Крепость Орешек) is one of a series of fortifications built in Oreshek (now known as Shlisselburg) on Orekhovy Island in Lake Ladoga, near the modern city of Saint Petersburg in Russia. The first fortress was built in 1323. It was the scene of many conflicts between Russia and Sweden and changed hands between the two empires. During World War II, it was heavily damaged. Today it is part of the UNESCO World Heritage site Historic Centre of Saint Petersburg and Related Groups of Monuments.

A wooden fortress named Oreshek (Орешек) or Orekhov (Орехов) was built by Grand Prince Yury of Moscow (in his capacity as Prince of Novgorod) on behalf of the Novgorod Republic in 1323. It guarded the northern approaches to Novgorod and access to the Baltic Sea. The fortress is situated on Orekhovy Island whose name refers to nuts in Swedish (Nötö) as well as in Finnish (Pähkinäsaari, "Nut Island") and Russian. After a series of conflicts, a peace treaty was signed at Oreshek on August 12, 1323 between Sweden and Grand Prince Yury and the Novgorod Republic. This was the first agreement on the border between Eastern and Western Christianity running through present day Finland. A modern stone monument to the north of the Church of St. John in the fortress commemorates the treaty. In 1333, the Novgorodians invited Lithuanian prince Narimantas to govern their north western domain. Narimantas appointed his son, Alexander Narimuntovich to rule the autonomous principality of Oreshek. In 1348, Magnus IV of Sweden attacked and briefly took the fortress during his crusade in the region in 1348–1352. It was largely ruined by the time the Novgorodians retook the fortress in 1351. The fortress was rebuilt in stone in 1352, by Archbishop Vasily Kalika of Novgorod (1330–1352), who, according to the Novgorod First Chronicle, was sent by the Novgorodians after several Russian and Lithuanian princes ignored the city's pleas to help them rebuild and defend the fort. The remnants of the walls of 1352 were excavated in 1969, and can be seen just north of the Church of St. John in the center of the present fortress.

In 1478, the Novgorod Republic was absorbed by the Muscovy who immediately started to strengthen their border with Sweden. The existing small citadel was demolished and a new stone fortress with seven towers was constructed, which occupied almost the complete island. The old Novgorodian basement was used to construct a new citadel with three towers inside the outer walls. The total length of the walls was about 740 meters. Their height up to 12 meters, and the width at the basement 4.5 meters; The towers were 14–16 meters high and 16 meters in diameter at the basement. This made it the strongest Russian fortress of that period. The residents were forced to resettle on the mainland and most preferred the Southern bank of Neva for safety reasons. During the Ingrian campaign of tsar Alexei Mikhailovich in June 1656, the fortress came under a siege by voevoda Pyotr Potemkin, known as the Battle of Nöteborg, which lasted until November 1656 with no success.

In 1702, during the Great Northern War, the fortress was taken by the Russians under Peter the Great in an amphibious assault: 440 Swedish soldiers defended the fort for ten days before surrendering. After heavy artillery fire and 13 hours of fighting inside the fortress, the Swedish commandant finally agreed to capitulate on honorable conditions. The Swedes left the fortress with their flags, rifles and four cannons. The Russian forces numbered 12,500 men and sustained a total of 1,500 casualties, compared to 360 for the Swedes. Peter renamed the fortress to Shlisselburg, a transliteration into the Cyrillic alphabet of Schlüsselburg. The name, meaning "Key fortress" in German, which refers to Peter's perception of the fortress as the "key to Ingria".

During Imperial times the fortress lost its military role and was used as a notorious political prison. The first two prisoners were Peter the Great's sister, Maria Alexeyevna Romanova, and his first wife Yevdokiya Lopukhina. The best known prisoner in the Shlisselburg Fortress was Ivan VI, who had inherited the throne as an infant, was interned there until he was murdered by his guards in 1764. After his murder, no more prisoners were sent to the fortress until 1775. In 1800 1870, the fortress held a probable total of 52 political prisoners, including Wilhelm Küchelbecker, and Mikhail Bakunin, most for short periods, though the Polish rebel, Walerian Łukasiński was in solitary confinement there for 38 years.

In 1928, the fortress was turned into a branch of the Museum of the October Revolution, but in 1939, shortly before the war, it was closed and the exhibits were moved to Leningrad. Shortly before Shlisselburg was occupied by the German troops (8 September 1941), a garrison of 350 Red Army soldiers was sent to the fortress on Orekhovets island to bring supplies and munition to the frontline. The garrison held the abandoned castle for 500 days preventing the Germans from landing there and cutting the last transit route from Leningrad to the mainland. Food and supplies were brought from the northern bank of the Neva which remained under Soviet control. Heavy artillery fire by the Germans destroyed all the buildings inside the fortress and part of the outer towers and walls, but despite numerous attempts the fortress was not captured. During Operation Iskra (18 January 1943) the siege of the fortress was lifted. The war completely devastated the fortress. Out of the original ten towers, the fortress retains only six (five Russian and one Swedish). The remains of a church inside the fortress were transformed into a memorial to the fortress's defenders. An archaeological site was established in the fortress during 1968 1975 that excavated what remained from the ancient Novgorodian stone fort dated 1352 and other artifacts. The fortress has been the site of an annual rock concert since 2003. There is also a museum of political prisoners of the Russian Empire and a small collection of World War II artillery. Renovation of the walls and towers is slow, although still underway. A stone monument in memory of the first Russo Swedish peace treaty (1323) was placed inside the fortress. Tourists can reach the island from May to October via Shlisselburg or from the Northern bank of Neva, via Petrokrepost' railway station with regular ferries that run every 10–15 minutes.